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Q: Fachverband Quantenoptik und Photonik

Q 48: Poster – Quantum Optics, Technologies, and Optomechanics

Q 48.8: Poster

Mittwoch, 12. März 2025, 17:00–19:00, Tent

Pure single-photon generation using pulsed SPDC in a monolithic cavity — •Xavier Barcons Planas^1,2, Helen M. Chrzanowski², Leon Messner², and Janik Wolters^2,3 — ¹Institut für Physik, Humboldt-Universität zu Berlin, Berlin, Germany — ²Institute of Optical Sensor Systems, German Aerospace Center, Berlin, Germany — ³Institut für Optik und Atomare Physik, Technische Universität Berlin, Berlin, Germany

Entangled states of multiple photons are essential for advancing the capabilities of photonic quantum technologies. The generation of large multi-photon entangled states requires light sources that provide highly pure photons with high efficiency (either deterministic or heralded), as these factors limit scalability. A common method is to herald single photons from photon-pair sources based on spontaneous parametric down-conversion (SPDC). While the multimode spatial and spectral nature of SPDC emission can constrain the heralding efficiency and purity, engineering techniques such as waveguide geometries [1], group velocity matching [2], and cavity resonators [3] can refine the output to exhibit single-mode behaviour. Here, we present a narrowband (170 MHz) single-photon source at the C-band based on pulsed SPDC in a monolithic crystal cavity. Pure and fiber-compatible single photons have been generated with 85% heralding efficiency.

[1] A. Christ et al., Phys. Rev. A 80, 033829 (2009)

[2] P. J. Mosley et al., Phys. Rev. Lett. 100, 133601 (2008)

[3] R. Mottola et al., Opt. Express 28, 3159 (2020)

Keywords: single-photon source; SPDC; monolithic cavity